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《Journal of Beijing Forestry University》 2009-02
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Roots of different dominant tree species in zonal vegetation in southern subtropical China.

HAO Yan-ru~1;PENG Shao-lin~2.1 School of Life Sciences,South China Normal University,Guangzhou,510631,P.R.China;2 State Key Laboratory of Biocontrol,Sun Yat-Sen University,Guangzhou,510275,P.R.China.  
In the Dinghu Mountain Biosphere Reserve Station of the subtropical area of southern China,representative dominant tree root system was examined with regard to their morphological characters,underground stratification and biomass distribution.Excavation of skeleton roots was carried out for seven tree species.The results demonstrated: 1) root shape varied in different dominant tree species at different layers.Tree roots in high tree stratum were dominant by the apparent taproot with significant roots up and down from plagiotropic branches or tactic braches.Shrub species and undergrowth roots were characterized by the heart fibrous root type featured both by horizontally and transversally growing branches. 2) Proportion of contrasting diameter roots in all roots was different among species,in particular,fine roots(2 mm) reached 10.7%,and coarse roots(20 mm) reached 46.4%-81.2%.Furthermore,proportion of root biomass to total one was different in varied soil layers and among tree species.3) Underground dominant species was stratified according to the supraterraneous stratification method,which rarely kept pace with the aboveground stratification.The study demonstrates that root morphological character and distribution may closely interrelate to plant interaction and structure of aboveground vegetation,and therefore further study is needed to well understand niche breadth in the habitat.
【Fund】: 国家自然科学基金项目(30270282);; 广东省特聘教授(珠江学者)基金项目
【CateGory Index】: S718.52
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